We were confronted with two younger pit bulls while we had our two larger senior dogs on leashes walking. These dogs were very fast but obviously inexperienced bitters. They were trying to grab the necks of our dogs which were both wearing metal pinch collars which protected their necks. I used a knuckle blaster stun gun on them when they went for the rear ends. The owners finally came and called them back. I have also had experience with a cattle dog and a Siberian husky coming after a single dog, both of those dogs were very fast. Our dogs show no aggression at all, and they think that other dogs are coming to make friends. Although most RVers don't have vicious dogs, some do especially with the variety of people that full-time live in RVs now, and dogs can be loose and run into the RV park areas from adjoining neighborhoods. Just keep in mind that some dogs/breeds are very agile and quick. Stun guns work well to discourage most dogs from approaching with just the static sound, not with the young pitbulls though. We have seen a lot of construction and pipe line workers with larger dogs that they travel with for protection. I have upgraded my knuckle blaster stun to a larger and more powerful stun stick with flashlight. They also have walking sticks with a stun feature. Do my dogs get loose and go after anyone? No, they don't.